Vitest

<p align="center"> <br> <br> <a href="https://vitest.dev" target="_blank" rel="noopener noreferrer"> <picture> <source media="(prefers-color-scheme: dark)" srcset="https://vitest.dev/vitest-light.svg"> <source media="(prefers-color-scheme: light)" srcset="https://vitest.dev/vitest-dark.svg"> <img alt="Vitest logo" src="https://vitest.dev/vitest-dark.svg" height="60"> </picture> </a> <br> <br> <br> </p> <h1 align="center"> Vitest </h1> <p align="center"> Next generation testing framework powered by Vite. <p> <p align="center"> <a href="https://npmx.dev/package/vitest"><img src="https://img.shields.io/npm/v/vitest?color=729B1B&label=" alt="current vitest version badge"></a> <p> <p align="center"> <a href="https://chat.vitest.dev"><b>Get involved!</b></a> </p> <p align="center"> <a href="https://vitest.dev">Documentation</a> | <a href="https://vitest.dev/guide/">Getting Started</a> | <a href="https://vitest.dev/guide/#examples">Examples</a> | <a href="https://vitest.dev/guide/why">Why Vitest?</a> </p> <p align="center"> <a href="https://cn.vitest.dev">中文文档</a> </p> <h4 align="center"> </h4> <br> <br>

Features

• Vite's config, transformers, resolvers, and plugins. Use the same setup from your app!
• Jest Snapshot
• Chai built-in for assertions, with Jest expect compatible APIs
• Smart & instant watch mode, like HMR for tests!
• Native code coverage via v8 or istanbul.
• Tinyspy built-in for mocking, stubbing, and spies.
• JSDOM and happy-dom for DOM and browser API mocking
• Browser Mode for running component tests in the browser
• Components testing (Vue, React, Svelte, Lit, Marko)
• Benchmarking support with Tinybench
• Projects support
• expect-type for type-level testing
• ESM first, top level await
• Out-of-box TypeScript / JSX support
• Filtering, timeouts, concurrent for suite and tests
• Sharding support
• Reporting Uncaught Errors
• Run your tests in the browser natively

Vitest requires Vite >=v6.0.0 and Node >=v20.0.0

import { assert, describe, expect, it } from 'vitest'

describe('suite name', () => {
  it('foo', () => {
    expect(1 + 1).toEqual(2)
    expect(true).to.be.true
  })

  it('bar', () => {
    assert.equal(Math.sqrt(4), 2)
  })

  it('snapshot', () => {
    expect({ foo: 'bar' }).toMatchSnapshot()
  })
})

$ npx vitest

Sponsors

<p align="center"> <a href="https://cdn.jsdelivr.net/gh/sheremet-va/static/vitest/sponsors.svg"> <img src='https://cdn.jsdelivr.net/gh/sheremet-va/static/vitest/sponsors.svg' alt="vitest's sponsors"/> </a> </p>

Vladimir Sponsors

<p align="center"> <a href="https://cdn.jsdelivr.net/gh/sheremet-va/static/sponsors.svg"> <img src='https://cdn.jsdelivr.net/gh/sheremet-va/static/sponsors.svg' alt="vladimir's sponsors"/> </a> </p>

Anthony Fu Sponsors

<p align="center"> <a href="https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg"> <img src='https://cdn.jsdelivr.net/gh/antfu/static/sponsors.svg' alt="anthony's sponsors"/> </a> </p>

Patak Sponsors

<p align="center"> <a href="https://cdn.jsdelivr.net/gh/patak-dev/static/sponsors.svg"> <img src='https://cdn.jsdelivr.net/gh/patak-dev/static/sponsors.svg' alt="patak's sponsors"/> </a> </p>

Credits

Thanks to:

• The Jest team and community for creating a delightful testing API
• @lukeed for the work on uvu where we are inspired a lot from.
• @pi0 for the idea and implementation of using Vite to transform and bundle the server code.
• The Vite team for brainstorming the initial idea.
• @patak-dev for the awesome package name!

Contribution

See Contributing Guide.

License

MIT License © 2021-Present VoidZero Inc. and Vitest contributors